.car-img{
    width: 100%;
}

nav{
    margin-top: 20px;
}

#sd{
    position: absolute;
    top: 0px;
    z-index: -9;
    width: 100%;
}

.to-top{
    z-index: 99;
}

.car-cont{
    margin-top: -300px;
    margin-bottom: 300px;
}

.carousel-inner .item{
    height: 400px;
    background-image: url(http://v2.bootcss.com/assets/img/examples/slide-01.jpg);
    background-repeat: no-repeat;
    background-position: top;
}

.item-1 {
    background-image: url(http://v2.bootcss.com/assets/img/examples/slide-01.jpg);
}

.item-2 {
    background-image: url(http://v2.bootcss.com/assets/img/examples/slide-02.jpg);
}

.item-3 {
    background-image: url(http://v2.bootcss.com/assets/img/examples/slide-03.jpg);
}